clasp
A conflict-driven nogood learning answer set solver

Overview

clasp is part of the Potassco project hosted at SourceForge. Source code and pre-compiled binaries are available on the Potassco download page.

clasp is an answer set solver for (extended) normal logic programs. It combines the high-level modeling capacities of answer set programming (ASP) with state-of-the-art techniques from the area of Boolean constraint solving. The primary clasp algorithm relies on conflict-driven nogood learning, a technique that proved very successful for satisfiability checking (SAT).

Unlike other learning ASP solvers, clasp does not rely on legacy software, such as a SAT solver or any other existing ASP solver. Rather, clasp has been genuinely developed for answer set solving based on conflict-driven nogood learning. clasp can be applied as an ASP solver (on SMODELS format, as output by Gringo), as a SAT solver (on a simplified version of DIMACS/CNF format), or as a PB solver (on OPB format).

clasp provides different reasoning modes including:

clasp's search procedure incorporates many advanced features from Boolean constraint solving, among them:

To get an impression of clasp's performance, visit the benchmarking area

For the system and a brief user introduction, visit the resources area

Find the latest information and tools at the Potassco project page